I have proved that there is only 698896 in 6-digit number.

來源: 於 2010-10-12 20:56:19 [舊帖] [給我悄悄話] 本文已被閱讀：次
there is no 4-digit number.

If we want to find next number,it at least is 8-digit number.n=121*m^2...m>300...